Fetch song lyrics from several internet lyric sites.

Changes for 1.32 - 2024-01-27

• LyricFinder::Letras - Make work again (discovered during general testing that Letras was no longer working due to aparent site changes).
• LyricFinder::ChartLyrics - Shush an improper error msg. (sites don't normally "carp" an error msg. for simple "no matching lyrics found"). Also add a fix for titles and artist names that contain Perl regex special characters.
• LyricFinder::Genius - Add a note in the docs about potential spam embedded in lyrics text returned.